Gary,

How long have you been on the list?

The Hanna TDS1 meter DOES NOT MEASURE PPM. The name TDS stands for
totally dissolved solids, and CS  IS NOT a totally dissolvedsolid.

We when throught that about two months ago. Some thing that will measure PPM is
a spectrophotometer or an Ion Selective Electrode. Both of which are many bucks.



Robert

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